Mailbox creation / delete error

Hi!

I have a strange problem, I can't create or delete mailboxes in siteworx (attached the errors).

The interworx is the latest release 5.1.7 1057 version

I checked the iw logs in /usr/local/interworx/var/log/error.log and there is an error: " sh: /home/vpopmail/bin/vadduser: Permission denied"

Does anybody have an idea for the solution?

Thanks, Gabor.

Attached Images